fix(test): set burst start at composition begin for IME input (@boergeson)

frontend/src/ts/input/handlers/insert-text.ts

@@ -174,7 +174,7 @@ export async function onInsertText(options: OnInsertTextParams): Promise<void> {
   if (Config.keymapMode === "react") {
     flash(data, correct);
   }
-  if (testInput.length === 0) {
+  if (testInput.length === 0 && !isCompositionEnding) {
     TestInput.setBurstStart(now);
   }
   if (!shouldGoToNextWord) {

frontend/src/ts/input/listeners/composition.ts

@@ -2,6 +2,7 @@ import { getInputElement } from "../input-element";
 import * as CompositionState from "../../legacy-states/composition";
 import * as TestState from "../../test/test-state";
 import * as TestLogic from "../../test/test-logic";
+import * as TestInput from "../../test/test-input";
 import { setLastInsertCompositionTextData } from "../state";
 import * as CompositionDisplay from "../../elements/composition-display";
 import { onInsertText } from "../handlers/insert-text";
@@ -22,6 +23,9 @@ inputEl.addEventListener("compositionstart", (event) => {
   if (!TestState.isActive) {
     TestLogic.startTest(performance.now());
   }
+  if (TestInput.input.current.length === 0) {
+    TestInput.setBurstStart(performance.now());
+  }
 });
 
 inputEl.addEventListener("compositionupdate", (event) => {

frontend/src/ts/test/test-stats.ts

@@ -215,6 +215,7 @@ export function setLastSecondNotRound(): void {
 export function calculateBurst(endTime: number = performance.now()): number {
   const containsKorean = TestInput.input.getKoreanStatus();
   const timeToWrite = (endTime - TestInput.currentBurstStart) / 1000;
+  if (timeToWrite <= 0) return 0;
   let wordLength: number;
   wordLength = !containsKorean
     ? TestInput.input.current.length